EP1764055A1 - Dispositif d'extraction d'éléments de fixation de tissus humains - Google Patents

Dispositif d'extraction d'éléments de fixation de tissus humains Download PDF

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Publication number
EP1764055A1
EP1764055A1 EP05108584A EP05108584A EP1764055A1 EP 1764055 A1 EP1764055 A1 EP 1764055A1 EP 05108584 A EP05108584 A EP 05108584A EP 05108584 A EP05108584 A EP 05108584A EP 1764055 A1 EP1764055 A1 EP 1764055A1
Authority
EP
European Patent Office
Prior art keywords
thread
fastening means
counter surface
distal end
centre line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05108584A
Other languages
German (de)
English (en)
Inventor
Harri Happonen
Petri Koho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inion Ltd
Original Assignee
Inion Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inion Ltd filed Critical Inion Ltd
Priority to EP05108584A priority Critical patent/EP1764055A1/fr
Priority to US11/470,768 priority patent/US20070093791A1/en
Priority to EP06120803A priority patent/EP1764056B1/fr
Priority to DE602006001705T priority patent/DE602006001705D1/de
Priority to AT06120803T priority patent/ATE400230T1/de
Priority to KR1020060090191A priority patent/KR20070032611A/ko
Priority claimed from EP06120803A external-priority patent/EP1764056B1/fr
Priority to CNA2006101542845A priority patent/CN1935095A/zh
Priority to JP2006252818A priority patent/JP2007083045A/ja
Publication of EP1764055A1 publication Critical patent/EP1764055A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A61B17/8886—Screwdrivers, spanners or wrenches holding the screw head
    • A61B17/8888—Screwdrivers, spanners or wrenches holding the screw head at its central region
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/18—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same withdrawing broken threaded parts or twist drills
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92—Impactors or extractors, e.g. for removing intramedullary devices

Definitions

  • the invention relates to a device for removal of fastening means from human tissue, and more particularly to a device for removal of fastening means from bone tissue.
  • Fastening means such as screws, pins, anchors, rivets, tacks etc. made of biodegradable materials have the benefit that they dissolve within the human body and, therefore, there is no need to remove the fastening means from the human body in another operation. It should be noted that all materials that dissolve in the human body are below referred to as 'biodegradable'.
  • a fastening means for example a screw
  • breaks during its installation so that a part of the screw remains in a hole into which it was screwed.
  • a head portion of a screw becomes damaged so that the screw cannot be screwed in its intended position in the hole, nor unscrewed out of the hole in order to remove the screw.
  • a fastening means can be broken due to excessive loading or accidents e.g. due to shearing forces, at the fixation interface.
  • a broken or damaged fastening means needs to be removed from the human body. It is also possible that a fastening means which is not broken or damaged is removed from the human body.
  • Some manufacturers have provided various retraction tools for removing a broken or damaged screw from bone tissue.
  • US 5,697,935 discloses an apparatus that comprises a hollow boring drill.
  • the drill has an internal cavity and an opening in its distal end to said cavity.
  • the distal end comprises also a cutting surface around the opening.
  • the operator places the cutting surface against bone tissue around the fastening means to be removed, and rotates the drill so as to cut into the bone tissue around the fastening means.
  • the surface of the internal cavity bites and adheres to the external surface of the fastening means.
  • the operator then can move the drill away from the bone tissue and remove the fastening means from the bone tissue.
  • US 6,004,321 discloses an apparatus that is provided for retraction of cannulated screws from bone tissue.
  • the apparatus comprises a reverse, self-tapping helix on a conical surface and a feeler shaft connected to the tip of the conical surface.
  • the feeler shaft guides the apparatus at the entry to the cannula of a fractured screw, and the reverse helix bites to the material of the screw to be removed.
  • An object of the present invention is to provide a device so as to alleviate the above disadvantages.
  • the objects of the invention are achieved by a device wherein the distal end comprises a thread section having a centre line that is coaxial with the longitudinal centre line of the shaft, and a left hand thread that screws around the centre line, and a counter surface that is disposed outside the thread and having a surface component direction which intersects one of said centre lines, the counter surface being disposed so that it can make contact with the fastening means to be removed as the thread is rotated into a hole in the fastening means.
  • the invention is based on the idea of using a combination of a left-hand screw and a counter surface in order to remove of a fastening means.
  • An advantage of the device of the invention is that a broken or damaged fastening means can be removed without damaging or expanding the fixation hole where the fastening means is fastened.
  • Figure 1 is a schematic side view of a device according to the invention
  • Figure 2 is a schematic side view of a detail of the same device.
  • the device comprises a shaft 2 made e.g. of stainless steel or other similar material that can be used in the manufacture of surgical devices and tools.
  • the shaft 2 has an elongated shape having a proximal end 3 and a distal end 4.
  • fixing means 5 for fixing the device 1 in a handle or a tool by means of which the device can be rotated around a centre line C of the shaft 2.
  • the tool can be e.g. a drilling machine or a gimlet or some other suitable tool.
  • the fixing means 5 can, of course, be designed in a manner different to that shown in Figure 1.
  • the proximal end 3 can also include a handle that is attached to or integrated in the shaft 2.
  • proximal end 3 and the distal end 4 can also be considerably shorter than that shown in Figure 1.
  • the distal end 4 is provided with a thread section 6.
  • the thread section 6 has a centre line D that is coaxial with the longitudinal centre line C of the shaft 2.
  • the threaded section 6 is an integral part of the shaft 2 in the device shown in Figure 1.
  • the threaded section 6 can be detachably attached to the shaft 2 by attaching means, e.g. threads.
  • the thread section 6 includes an external screw thread 7 that screws itself around the centre line D of the thread section 6.
  • the screw thread 7 is a left-hand thread, i.e. opposite to usual threads. Therefore, it must be rotated anti-clockwise in order to screw the thread 7 into a hole.
  • One screw thread 7 is provided in the thread section 6, extending as a uniform thread from one end to the other end of the thread section 6.
  • the outer diameter of the screw thread 7 is constant, with the exception of a convergent area close to the outmost end of the distal end 4.
  • the height of the screw thread 7 is constant, apart from the convergent area.
  • the height of the screw thread is about 15% of the outer diameter of the thread in the thread section shown in Figure 2.
  • the height of the screw thread 7 may be advantageously selected from a range between 5% and 20%. Such a relatively high thread is preferable in order to prevent the fastening means from expanding in its hole. For the same reason, a relatively thin thread is also preferable.
  • a pitch of the screw thread 7 is constant throughout the length of the thread section 6.
  • the distal end 4 is also provided with a first counter surface 8a and a second counter surface 8b.
  • the first counter surface 8a is located between the thread section 6 and the shaft 2. It is a collar-like plane surface perpendicular to the centre line D of the thread section 6.
  • the outer diameter of the first counter surface 8a is substantially larger than that of threaded section 6 and equal to the diameter of the shaft 2.
  • the outer diameter of the first counter surface 8a can be smaller or larger than the diameter of the shaft 2.
  • the operator has first drilled the borehole 9 in the screw 10.
  • the borehole 9 is preferably made parallel to the longitudinal axis of the screw 10.
  • the borehole is also preferably coaxial with said longitudinal axis. A slight non-paralellism or offset does not cause any harm to the operation.
  • the borehole 9 can be made with any known drill bit and drilling method and, therefore, this is not discussed in more detail herein.
  • the diameter of the drill bit should, of course, match the dimensions of the thread 7.
  • the outer diameter of the drill bit is preferably slightly larger than the inner diameter of the thread 7. In this way, the threaded section 6 does not expand radially the screw to be removed.
  • the device is not only suitable for removal of broken fastening means but it is also suitable for removal of fastening means whose head is damaged as well as fastening means not damaged at all but which still need to be removed from a human or animal body.
  • the device is suitable for removal of any fastening means made of a biodegradable material or even fastening means made of any biostabile polymer material into which the threaded section can be attached that needs to be removed from a human or animal body.
  • the device is also suitable for removal of cannulated fastening means.
  • it is not always necessary to drill a borehole in the fastening means prior to insertion of the thread section 6. Instead, the cannula of the fastening means can be exploited as a hole where the thread section 6 is inserted in.
  • fastening means refers to screws, pins, pegs, anchors, rivets, tacks etc.
  • fastening means refers to screws, pins, pegs, anchors, rivets, tacks etc.
  • the pin may still be screwed out of its attachment hole.
  • the thread section 6 is attached firmly to the pin, the pin is simply pulled out of the hole with the help of the device.
  • first counter surface 8a shown in Figure 2 functions as disclosed above if it is the first counter surface of the two counter surfaces 8a, 8b that squeezes against the fastening means to be removed.
  • Figure 4 is a schematic and partly cross-sectional side view of a third device according to the invention arranged in a fastening means to be removed from bone tissue.
  • the device comprises a shaft 2, shown only in part, and a distal end having a threaded section 6 with a left-hand screw thread 7.
  • the distal end 4 also comprises a counter surface 8b fitted at the outmost end of the distal end 4.
  • the device shown in Figure 4 functions in the same way as the device shown in Figure 3.
  • the main difference is that because the counter surface 8b is situated at the outmost end of the distal end 4, it squeezes against a bottom 13 of the borehole 9. Accordingly, the thread 7 of the thread section 6 pushes the counter surface 8b against the bottom 13 of the borehole 9, and as soon as a sum of frictional forces between the counter surface 8b and the bottom 13 of the borehole, and, on the other hand, between the thread section 6 and the borehole 9 exceeds the jamming force of the fastening means 10, which is a screw in Figure 4, the fastening means 10 begins to screw itself out of the tissue.
  • the second counter surface 8b shown in Figure 2 functions as discussed above if it is the first counter surface of the two counter surfaces 8a, 8b that squeezes against the fastening means to be removed.
  • Figures 5a to 5e are schematic cross-sectional side views of some other thread designs of devices according to the invention.
  • the thread 7 of the thread section 6 can be realized in various ways.
  • Figures 5a to 5e show some examples of this.
  • the thread 7 is a trapezoid thread.
  • the angle between a leading face 14 of the thread 7 and a plane perpendicular to the centre line D of the threaded section is smaller than the angle of a back face 15 of the thread 7. Contrary to this, the angle between the leading face 14 of the thread 7 and a plane perpendicular to the centre line D of the thread section is larger than the angle of the back face 15 of the thread 7 in Figure 5c.
  • the leading face 14 and the back face 15 are arranged into a very same angle with that of a plane perpendicular to the centre line D.
  • the profile of the thread 7 has a sharp outer edge and curved leading and back faces.
  • the thread section 6 may also have two or more screw threads 7, in which case it is a multi-end threaded section.
  • the screw thread 7 can be discontinuous such that at one or more points, it is completely or partially cut.
  • the profile, pitch, height and thickness of the screw thread 7 may vary throughout the length of the threaded section.
EP05108584A 2005-09-19 2005-09-19 Dispositif d'extraction d'éléments de fixation de tissus humains Withdrawn EP1764055A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP05108584A EP1764055A1 (fr) 2005-09-19 2005-09-19 Dispositif d'extraction d'éléments de fixation de tissus humains
US11/470,768 US20070093791A1 (en) 2005-09-19 2006-09-07 Device for removal of fastening means from human tissue
EP06120803A EP1764056B1 (fr) 2005-09-19 2006-09-18 Dispositif d'extraction d'éléments de fixation de tissus humains
DE602006001705T DE602006001705D1 (de) 2005-09-19 2006-09-18 Vorrichtung zum Entfernen von Befestigungsmitteln aus menschlichem Geweben
AT06120803T ATE400230T1 (de) 2005-09-19 2006-09-18 Vorrichtung zum entfernen von befestigungsmitteln aus menschlichem geweben
KR1020060090191A KR20070032611A (ko) 2005-09-19 2006-09-18 인체 조직으로부터 고정 수단을 제거하기 위한 장치
CNA2006101542845A CN1935095A (zh) 2005-09-19 2006-09-19 用于从人体组织拆除紧固装置的设备
JP2006252818A JP2007083045A (ja) 2005-09-19 2006-09-19 人体組織から緊締手段を除去する装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05108584A EP1764055A1 (fr) 2005-09-19 2005-09-19 Dispositif d'extraction d'éléments de fixation de tissus humains
EP06120803A EP1764056B1 (fr) 2005-09-19 2006-09-18 Dispositif d'extraction d'éléments de fixation de tissus humains

Publications (1)

Publication Number Publication Date
EP1764055A1 true EP1764055A1 (fr) 2007-03-21

Family

ID=38600653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05108584A Withdrawn EP1764055A1 (fr) 2005-09-19 2005-09-19 Dispositif d'extraction d'éléments de fixation de tissus humains

Country Status (1)

Country Link
EP (1) EP1764055A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5688285A (en) * 1995-08-29 1997-11-18 Yamada; Ikufumi Graft bone fixation tool
US5697935A (en) 1995-09-12 1997-12-16 Medex Marketing, Inc. Device and method for removing fastening implements from bone
US5906616A (en) * 1994-09-15 1999-05-25 Surgical Dynamics, Inc. Conically shaped anterior fusion cage and method of implantation
US5941885A (en) * 1996-10-08 1999-08-24 Jackson; Roger P. Tools for use in installing osteosynthesis apparatus utilizing set screw with break-off head
US5951554A (en) * 1997-10-02 1999-09-14 Holmes; Russell P. Screw removal system
US6004321A (en) 1998-03-19 1999-12-21 Graser; Robert E. Cannulated screw retraction apparatus and method of retraction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5906616A (en) * 1994-09-15 1999-05-25 Surgical Dynamics, Inc. Conically shaped anterior fusion cage and method of implantation
US5688285A (en) * 1995-08-29 1997-11-18 Yamada; Ikufumi Graft bone fixation tool
US5697935A (en) 1995-09-12 1997-12-16 Medex Marketing, Inc. Device and method for removing fastening implements from bone
US5941885A (en) * 1996-10-08 1999-08-24 Jackson; Roger P. Tools for use in installing osteosynthesis apparatus utilizing set screw with break-off head
US5951554A (en) * 1997-10-02 1999-09-14 Holmes; Russell P. Screw removal system
US6004321A (en) 1998-03-19 1999-12-21 Graser; Robert E. Cannulated screw retraction apparatus and method of retraction

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